RIVER GAUGE · WHETSTONE RIVER
Whetstone River above Big Stone City
Grant County, South Dakota
Water level1.40 ft
Flow10 cfs
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action11 ft3,594 cfs
Minor flood12 ft4,430 cfs
Moderate flood15 ft8,161 cfs
Major flood20 ft
The past week
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What floods at each level
- 12 ft
The road 2 miles west and 1 mile south of the gauge floods.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| May 31, 1919 | 26 ft | 29,000 cfs |
| Apr 7, 2001 | 15.93 ft | 9,930 cfs |
| Mar 12, 2007 | 15.08 ft | 9,060 cfs |
Get an alert when Whetstone River rises
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